/hu: ||; hu/pronoun1 used in questions to ask sb's name, identity, position, etc （用于疑问句中询问姓名、身分、地位等）: Who was on the phone? 打电话来的是谁？Who's that woman in the grey suit? 那个穿灰色套装的女人是谁？She wondered who he was. 她不知道他是谁。
2 used for saying exactly which person or what kind of person you are talking about （用于确切表明所谈及的为何人或哪一类人）: I like people who say what they think. 我喜欢说真心话的人。That's the man who I met at Ann's party. 那个就是我在安的宴会上认识的男子。The woman who I work for is very nice. 我替她做事的那位女士人很好。
In the last two examples (= when ‘who’ is the object, or when it is used with a preposition) ‘who’ can be left out That's the man I met at Ann's party. The woman I work for is very nice. 上述最后两个例子中（who为宾语与介词连用）可省去who：That's the man I met at Ann's party.那个就是我在安的宴会上认识的男子。·The woman I work for is very nice.我替她做事的那位女士人很好。 3 used for giving extra information about sb （用于作补充）: My mother, who's over 80, still drives a car. 我的母亲已80多岁了，但仍然开车。 ☞The extra information you give is separated from the main clause by commas. 补充的信息要用逗号与主句隔开。 ☞Look at the note at whom. 参看whom的注释。